Using image which built via 2239 in 8th Apri, on some of our clusters, after creating ra, it may take 2~3 minutes to update the status, and without frrconfiguration applied, it still moved to "accepted" status. After all configuration done (cudn, ns, pods, ra, frr, external frr, etc), pod network route is not advertised to external frr. 

Checked on ovnkube-control-plane pods and found error below:
...
network: default
I0411 07:39:45.504904       1 controller.go:262] Finished syncing routeadvertisements "default", took 56.493µs
I0411 07:39:45.504938       1 controller.go:257] Controller clustermanager routeadvertisements controller: error found while processing default: failed to reconcile RouteAdvertisements "default": BGP is currenty not supported for Layer2 networks in local gateway mode, network: default

# cat ra.yaml 
apiVersion: k8s.ovn.org/v1
kind: RouteAdvertisements
metadata:
  name: default
spec:
  networkSelector:
    matchLabels:
      k8s.ovn.org/default-network: ""
  advertisements:
  - "PodNetwork"
  - "EgressIP"

# cat frr.yaml 
apiVersion: frrk8s.metallb.io/v1beta1
kind: FRRConfiguration
metadata:
  name: receive-all
  namespace: openshift-frr-k8s
spec:
  bgp:
    routers:
    - asn: 64512
      neighbors:
      - address: 192.168.111.1
        disableMP: true
        asn: 64512
        toReceive:
          allowed:
            mode: all